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<blockquote class="extDef">NOTE&nbsp; Definition according to ISO/CD 10303-42:1992<br>
A subedge is an edge whose domain is a connected portion of the domain of an existing edge. The topological constraints on a subedge are the same as those on an edge.</blockquote> 

<blockquote class="note">NOTE&nbsp; Entity adapted from <strong>subedge</strong> defined in ISO 10303-42.</blockquote>
<blockquote class="history">HISTORY&nbsp; New entity in IFC2x2.</blockquote>

<p class="spec-head">Informal Propositions:</p> 
<ol> 
<li>The domain of the subedge is formally defined to be the domain of the parent edge, as trimmed by the subedge start vertex and subedge end vertex.</li> 
<li>The start vertex and end vertex shall be within the union of the domains of the vertices of the parent edge and the domain of the <em>parent edge</em>.</li> 
</ol> 